Hi,
I've a decision to make and i need some advices, i need a general purpose lens, i now have a 7D with an EF 70-300mm f/4-5.6 is usm.

Buy a EF-S 15-85 f/3.5-5.6 is usm for around $900 or go for a EF 24-105 f/4 L is usm for $1200?
Anyone have shot with these 2 lenses? IQ of 24-105 really worth 300$ extra?

I would appreciate your opinion.

Ricky